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Navajo Generating Station

FILE - This Sept. 4, 2011 file photo shows the main plant facility at the Navajo Generating Station, as seen from Lake Powell in Page, Ariz. The federal government is proposing new limits for pollution from the coal-fired power plant on the Navajo Nation that it says will improve visibility at places like the Grand Canyon, but it could come with a price tag of more than $1 billion, according to the plant's owners. (AP Photo/Ross D. Franklin, File)